chore: minor refactor

[vonovak]

Please provide enough information so that others can review your pull request:

Motivation

1. eslintrc : there is no need to pass rules to prettier, it will take them from prettierrc
2. BottomSheetHandleContainer.tsx - useMemo is not needed for a boolean
3. onScrollBeginDrag -> onScroll - the events listener should be passed under onScroll as documented in https://docs.swmansion.com/react-native-reanimated/docs/2.0.0-rc.2/api/useAnimatedScrollHandler/#returns
4. useScrollableInternal.ts - removed a line that likely has no effect

Math.round - on android device I was getting some wild snap points like 123.999428435834 and figured it might be nicer to round them to integer numbers so that when there is some arithmetics done (eg adding some numbers and then comparing numbers via === can fail) it might be safer to do work with whole numbers.

tested locally with example app

[gorhom]

@vonovak could you run yarn lint --fix on the root project, and add the changes on this pr, thanks <3

[gorhom]

thanks @vonovak!